Factors Impacting Resistance of Pencil Lead

 Factors Influencing Resistance of Pencil Lead Essay

Factors Influencing Resistance of Pencil Business lead

Abstract:

The investigation involved assessment the factors of pen lead size, cross-sectional location, temperature and lead type to find out how they affected pencil resistance. The hypothesis was proven while the length (series circuit) chart was rapid and the location (parallel circuit) graph was that of a power function. Bigger clay based pencils (2H) got higher capacity that of bigger graphite centered pencils (6B), and temperature did not tremendously affect the resistance. The reasons as to why diamond will not conduct electric power were also identified.

Aim:

To investigate the effect that different facets have about pencil lead (graphite) level of resistance. The factors tested include, pencil lead type (HB, 2B... ), temperature, length and cross-sectional area. Hypothesis:

The relationship among length and resistance ought to show a great exponential romantic relationship. The relationship between cross sectional area and resistance can be a power relationship. The type of business lead and level of resistance will not show any thready relationship, but it is thought that the more clay based potential clients 2h will have higher resistance than the more graphite centered 6B. The temperature benefits will also be hard to graph effectively due to hardly any change in the present and volt quality. Justification of Hypothesis:

Because learnt in class, via previously experiments, the longer the size of a resistor the lower the present as electrons have even more to travel which will intern provides higher resistance. This has been tested by series circuits which can be the method in which length will be tested. Location will be examined by using seite an seite circuits, doing this the cross-sectional area of the resistors is increased while the distance is kept the same. This allows the electrons to pass more readily increasing the existing and lowering the level of resistance. The amount of resistance of pencils of different lead types will be difficult to evaluate as the grading of pencils would not incur the resistance, furthermore access to all types of pencil leads may be hard therefore not allowing assessment on each sort of pencil business lead and leaving gaps and jumps in the data. Intended for the testing of temperature short, thicker pencils would raise the rate when pencil prospects heat up, this mean that a 5cm 6B lead pad should heat up much faster when compared to a 15cm 2h pencil although due to very little change going on in the heating up of a pencil resistance should only change fractionally.

Method:

In all of the tests pencil extent were 18. 5cm very long. In the testing of duration and get across sectional area, HB pencils were employed, in the screening of heat a 2B pencil utilized and in the testing of sort of pencil business lead a 2H, HB, 2B, 4B and 6B pencils were employed. Before virtually any tests will be begun ensure both ends of the pencils have been sharpened. Test pertaining to length (series circuits):

1 . Affix the power pack to the electricity point and set the volts to 6v. 2 . Connect the amplifier meter for the positive port of the power pack. a few. Connect one particular end of the HB pen to the negative end with the amp m and the opposite end to the unfavorable terminal of the power bunch. 4. Switch on the power packs and record the comes from the amp meter. five. Turn off the power pack; put another pencil into the routine between the initially pencil and the negative terminal of the electric power pack. 6th. Repeat actions 4 and 5 until all four pencils have been placed in the routine and documented. Test intended for cross-sectional place (parallel circuits):

1 ) Attach the power pack to the power level and set the voltage to 6v. installment payments on your Connect the amp m to the confident terminal in the power pack. 3. Connect one end of the HB pencil towards the negative end of the amplifying device meter as well as the other end for the negative terminal of the electric power pack. 5. Turn on the strength pack and record the results from the amp colocar. 5. Turn off the power pack; connect the next pencil for the ends of the other pencil. 6th. Repeat measures 4 and 5 right up until all...

Bibliography::

http://www.citycollegiate.com/carbonsiliconIXa.htm Seen: 25/10/11

http://www.avogadro.co.uk/structure/chemstruc/network/g-molecular.htm Accessed 25/10/10

http://hyperphysics.phy-astr.gsu.edu/hbase/electric/resis.html Seen 1/11/11

http://www.doctronics.co.uk/resistor.htm Accessed 3/11/11

http://www.edinformatics.com/math_science/carbon.htm Reached 4/11/11

http://www.scientificamerican.com/article.cfm?id=how-can-graphite-and-diam Accessed 4/11/11

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